Aztec pyramid ruins found in Mexico City

Construction workers unearthed ancient walls in the busy Iztapalapa neighborhood in June, and government archeologists said on Wednesday they believe they may be part of the main pyramid of the Aztec city, destroyed by conquistador Hernan Cortes in the 16th century. 

Iztapalapa, now infamous for violent crime and drug dealing, has grown into a sprawling, poor district of the capital, obscuring the ruins.